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u5=5^2. 2.5
=25.10
=250
b.un=1/n+3
u5=1/5+3
=16/3
c.un=n^3-2n^2+5
u5=5^3-2.5^2+5
=125-2.25+5
=125-50+5
=80
d.un=1/2n^2+2n+5
u5=1/2.5^2+2.5+5
=1/2.25+10+5
=25/2+20/2+10/2
=55/2
e.un=n/n^2+1
u5=5/5^2+1
=5/25+1
=5/25+25/25
=30/25=6/5